WO2014084659A1

WO2014084659A1 - Antenna provided with apparatus for extending beam width for mobile communication base station

Info

Publication number: WO2014084659A1
Application number: PCT/KR2013/010998
Authority: WO
Inventors: 문영찬; 소성환; 정현정; 최재중
Original assignee: 주식회사 케이엠더블유
Priority date: 2012-11-30
Filing date: 2013-11-29
Publication date: 2014-06-05
Also published as: EP2928014A1; EP2928014A4; CN104798253A; KR20140069971A; JP2015535667A; US20150263415A1

Abstract

Disclosed is an antenna provided with an apparatus for extending beam width for a mobile communication base station. An antenna for a base station according to an embodiment of the present invention comprises: a reflector plate; an emitting element disposed on the reflector plate; and an apparatus for extending the width of a beam, the apparatus being fixedly disposed at a previously set distance from the emitting element in the direction of emission thereof and made of thin metal.

Description

Mobile communication base station antenna with beam width expanding device

The present invention relates to a base station antenna for use in a mobile communication system, and more particularly, to a base station antenna having a beam width expanding device for expanding the beam width of a radiating element provided in the antenna.

Antennas used in a base station including a repeater of a mobile communication system may have various forms and structures. Recently, a base station antenna generally uses a dual band dual polarized antenna structure by applying a polarization diversity scheme.

A dual band dual polarization antenna is typically at least one in which the first radiation elements in the low frequency band (eg 700 MHz band) and the second radiating elements in the high frequency band (eg 1.9 GHz band) are upright in the longitudinal direction. It has a structure arrange | positioned suitably on a reflecting plate. Each of the first and second radiating elements is used to transmit (or receive) two linear polarizations that are orthogonal to one another, for example, aligned at +45 degrees and -45 degrees with respect to the vertical (or horizontal).

For such a dual band dual polarized antenna, there is exemplified what is disclosed in patent application No. 2000-7010785 (name: dual polarized multiband antenna) filed in Korea by Katline-Berke Cage.

On the other hand, the horizontal beam width of the radiation beam generated by each radiating element (and a combination of radiating elements) in the base station antenna is one of the very main characteristics of the antenna, in order to satisfy the beam width required for the use conditions and environment And constant research on the overall antenna design. At this time, research is being conducted in the direction of widening the beam width in order to make the antenna have a wider coverage range.

The present invention provides a mobile communication base station antenna having a beam width expanding device for expanding the beam width of a radiating element with a relatively simple structure and minimal equipment addition without affecting the radiation characteristics of the antenna as much as possible. .

In order to achieve the above object, the present invention provides a mobile communication base station antenna having a beam width expansion device; A reflector; A radiating element provided on the reflecting plate; The base station antenna, characterized in that fixed to be installed at a predetermined distance above the radiating element, comprising a beam width expanding device made of a thin metal body.

As described above, the mobile communication base station antenna having the beam width expanding apparatus according to the present invention can increase the beam width of the radiating element with a relatively simple structure and minimal equipment addition without adversely affecting the radiation characteristics as much as possible. .

1 is a plan view of a beam width expanding apparatus in a mobile communication base station antenna according to an embodiment of the present invention;

2A and 2B are structural diagrams of a beam width expanding apparatus installed in each radiating element in a mobile communication base station antenna according to an embodiment of the present invention;

3 is a perspective view of the radiating element and the beam width expanding apparatus shown in FIGS. 2A and 2B

4A and 4B are structural diagrams of a mobile communication base station antenna having a beam width expanding apparatus according to an embodiment of the present invention;

5 is a diagram schematically illustrating a beamwidth expansion state by a beamwidth expansion device installed in each radiating element in a mobile communication base station antenna according to an embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the accompanying drawings and related description, the same reference numerals are given to the same components as much as possible.

1 is a plan view of a beam width expanding apparatus in a mobile communication base station antenna according to an embodiment of the present invention, Figures 2a and 2b is a beam width expanding apparatus installed in each radiating element in a mobile communication base station antenna according to an embodiment of the present invention As a side and plan view of the structure, the beam width expanding apparatus shown in FIG. 1 is shown installed on the radiating element, and FIG. 3 is a perspective view of the radiating element and the beam width expanding apparatus shown in FIGS. 2A and 2B.

1 to 3, the beam width expanding apparatus 10 installed in the mobile communication base station antenna according to an embodiment of the present invention is a distance that is appropriately spaced apart in the radial direction of each radiating element 2 of the mobile communication base station antenna. It is fixedly installed at.

The beamwidth expanding apparatus 10 may be composed of, for example, a thin metal body which is generally circular. The beam width expanding apparatus 10 may be formed of a thin metal body made of a conductive material. For example, the beam width expanding apparatus 10 may be configured by a silver plated structure on a thin metal material made of copper or aluminum.

The position where the beam width expanding apparatus 10 is installed on the upper portion of the radiating element 2 is installed based on the center position of the beam radiated from the radiating element 2 (that is, for example, the center thereof is the radiating element ( 2) installed so that the beam width expanding device 10 is included in the beam width of the beam initially radiated from the radiating element 2 so as to directly affect the pattern of the emitted beam. do. In this case, including the installation position of the beam width expanding apparatus 10, the overall size and shape of the beam width expanding apparatus 10, the pattern of the beam initially radiated from the radiating element 2, the beam width expanding apparatus 10 is It is designed in consideration of the change of the radiation pattern and the radiation loss according to the installation.

An example of a state in which the beam width of the beam radiated from the radiating element 2 is enlarged when the beam width expanding device 10 is installed above the radiating element 2 is shown in FIG. 5. 5 (a) schematically shows a beam width of a beam radiated from the radiating element 2 in a general state in which the beam width expanding apparatus 10 is not installed. In FIG. The beam width of the beam radiated from the radiating element 2 in the state where the beam width expanding device 10 according to the embodiment is installed is schematically illustrated. As shown in FIG. 5, in a general state, the beam width of the beam radiated from the radiating element 2 may be 60 degrees, but when the beam width expanding apparatus 10 of the present invention is installed, the radiating element 2 may be The beamwidth of the emitted beam can be expanded to 70 to 90 degrees.

As described above, the beam width is enlarged by the beam width expanding apparatus 10 when the object having the dielectric constant is placed on the area where the beam is radiated in the radiating element 2, and the radiation pattern of the beam is changed.

Of course, in this case, the beam width expanding device 10 placed at the site where the beam is radiated in the radiating element 2 will bring a loss in terms of the radiation gain, and in order to reduce such a loss, the beam width expanding device 10 is possible. It is made thin. When the beam width expanding apparatus 10 is made thin enough, the radiation characteristics required by the corresponding radiating element 2 can be sufficiently satisfied even if a loss occurs.

The overall planar shape of the beamwidth expanding device 10 may have a circular band shape, as shown in FIG. 1 and the like, and additionally, at least one or more, which extends inwardly, for example, in a central direction, of the circular band shape. It may have a branch portion 140. The plurality of branch portions 140 are likewise composed of thin metal pieces. In addition, in the beam width expanding apparatus 10, a plurality of through-holes 120 into which the support part 12 described later is inserted and fixed may be formed in a plurality of portions having a circular band shape, including the plurality of branch portions 140.

The detailed structure having a plurality of branch portions 140 of the beam width expanding device 10 affects the pattern of the radiation beam of the radiating element 2 as well, and the beam pattern, in particular the beam width, can be influenced by relatively minor structural differences. Significant fluctuations can be made, so when adding and changing detailed structures, the corresponding radiation characteristics are experimentally checked to find the optimal structure.

When the beam width expanding apparatus 10 having such a configuration is installed on the upper portion of the radiating element 2, as shown more clearly in FIG. 2A, the beam width expanding device 10 is fixed on the reflecting plate 1 through a separate support 12. Is installed. The support 12 may be made of a synthetic resin material such as plastic so as not to affect the radiation characteristics of the radiating element 2 as much as possible, and the screw is coupled through the through hole 120 formed in the beam width expanding apparatus 10. (Plastic material) may be configured to fix the beamwidth expanding apparatus 10. In addition, in this case, the support part 12 may be installed to be fixed to the reflector 1 by a screw coupling method through a screw hole (not shown) formed in the reflector 1 in advance. At this time, it can be seen that the support 12 is configured and installed so that one side is in contact with the reflecting plate 1 and the other side is bonded to the beam width expanding apparatus 10.

Of course, even in this case, since the installation of the support 12 supporting the beam width expanding apparatus 10 affects the pattern of the radiation beam of the radiation element 2, in consideration of this additionally, the support 12 and the beam width The detailed structure of the enlargement apparatus 10, an installation position, etc. are designed.

4A and 4B are structural diagrams of a mobile communication base station antenna having a beam width expanding apparatus according to an embodiment of the present invention. FIG. 4A shows a side structure, and FIG. 4B shows a planar structure. The base station antenna shown in Figs. 4A and 4B is, for example, the first radiating element 3 in the low frequency band (700 MHz band) and the second radiating element 2 in the high frequency band (1.9 GHz band) upright in the longitudinal direction. The structure is properly disposed on the reflecting plate 1, in which four second radiating elements 2 are arranged at upper and lower portions of both sides of the first radiating element 3 around the first radiating element 3. The structure is shown. In this case, each of the second radiating elements 2 is provided with a beam width expanding apparatus 10 according to an embodiment of the present invention, each of the second radiating elements 2 shown in Figs. 4a and 4b and The beamwidth expanding apparatus 10 may have the same structure as the radiating element 2 and the beamwidth expanding apparatus 10 shown in FIGS. 1 to 3.

4A and 4B, the beam width expanding apparatus 10 of the present invention is installed on the plurality of second radiating elements 2 to expand the beam width of the second radiating elements 2. have. At this time, the installation height and size of the beam width expanding apparatus 10 is designed so as not to adversely affect the radiation characteristics of the first radiating element 3 in consideration of the surrounding first radiating element 3.

Meanwhile, in addition, in FIG. 4A and FIG. 4B, auxiliary sidewalls 4 are additionally installed on both sides of the second radiating elements 2 in the same material as that of the reflecting plate 1 in order to increase the beam width of the second radiating elements 2. The state is shown. In order to increase the beam width of the second radiating elements 2, such an auxiliary side wall 4 may be additionally used, and by optimizing the height of the auxiliary side wall 4, the beam width of the second radiating element 2 may be optimized. It is possible.

The other considerations for increasing the beam width of the second radiating element 2 are to design the height of the second radiating element 2 to be high. Thus, the height of the second radiating element 2 is higher than the appropriate value. In this case, the voltage standing wave ratio (VSWR) characteristic is degraded, and the radiation characteristic of the first radiating element 3 disposed in the periphery can be affected.

In addition, a method of widening the beam width of the radiating element by narrowing the width of the reflecting plate 1 may also be considered. In the case where the width of the reflecting plate 1 becomes narrower than an appropriate value, due to the lack of ground area, the front and rear ratio FBR: Front Back Ration characteristics deteriorate.

Therefore, in order to enlarge the beam width of the second radiating elements 2, an appropriate design of the auxiliary side wall 4 and a proper design of the height of the second radiating element 2 and the width of the reflecting plate 1 are performed. Through this, the beam width of the second radiating element 2 may be formed to be as wide as possible within the range that satisfies the radiation characteristic required for the entire antenna. In addition, when the beam width expanding apparatus 10 according to the present invention is further installed, the beam width expanding effect can be further increased.

Moreover, the beamwidth expanding apparatus according to the present invention is relatively simply additionally installed without any change in the radiating element structure of the existing antenna, thereby expanding the beam width of the radiating element of the corresponding antenna.

As described above, the configuration and operation of a mobile communication base station antenna having a beam width expanding apparatus according to an embodiment of the present invention can be made. Meanwhile, the above-described description of the present invention has been described with reference to specific embodiments, but various modifications have been made. It may be practiced without departing from the scope of the invention.

For example, in the above embodiment, it has been described that the beamwidth expanding apparatus has a plurality of branch portions extending inward in a circular band shape connected to each other as a whole, but the beamwidth expanding apparatus may have a structure that is not connected to each other as a whole. For example, the shape may be generally rectangular, or may have various branching portions extending to the outside instead of the inside.

In addition, in the above embodiment, the support portion has been described as fixing the beam width expansion device by using a through hole formed in the beam width expansion device, but in addition, the support portion has a clip structure or the like to hold a portion of the beam width expansion device by the beam width It may have various structures such as fixing the magnification device.

In addition, in the above embodiment, as shown in FIGS. 4A and 4B, a specific arrangement of the first and second radiating elements is shown. In addition, the first and second radiating elements have various arrangements. It can have In addition, in a specific structure, the antenna may be implemented using only the second radiating element, and in this case, the beam width expanding apparatus of the present invention may be installed. In addition, in the above embodiment, it has been described that the beamwidth expanding apparatus is installed only in the second radiation element, but the beamwidth expanding apparatus of the present invention may be implemented in the first radiation element.

Claims

A mobile communication base station antenna having a beam width expanding device,

A reflector;

A radiating element provided on the reflecting plate;

The base station antenna, characterized in that it is fixed to be installed at a predetermined distance in the radial direction of the radiating element, comprising a beam width expansion device made of a thin metal body.
The base station antenna of claim 1, wherein the beam width expanding apparatus is a thin metal body made of a conductive material.
The base station antenna of claim 1, wherein the beam width expanding apparatus has a circular band shape and has branch portions extending in the center direction of the circular shape.
The base station antenna of claim 1, wherein the beam width expanding apparatus is fixedly installed on the reflector through a separate support part.
The base station antenna of claim 1, wherein auxiliary sidewalls are additionally formed on both side surfaces of the radiating element using the same material as that of the reflecting plate.
The base station antenna according to claim 1, wherein the beam width expanding apparatus has a center thereof at the same axis as a center of the radiating element.
The method of claim 4, wherein the support portion is one side in contact with the reflector and the other side is in contact with the beam width expanding device,

The base station antenna, characterized in that the material is a synthetic resin.